buzztone on "[Plugin: Contact Form 7] how to make 2 forms with different styles in contact form 7?"

Each CF7 form has a unique ID like wpcf7-f8-p275-o2. Use Firebug or Chrome Dev Tools to find the ID of each form and then target your CSS changes to each individual form e.g.

#wpcf7-f8-p275-o2 .wpcf7-form {
    background:#dcc8a5;
    padding:20px;
    border:2px solid #f6efdf;
    margin-bottom:30px;
}

To change the style of your CF7 forms you would need to edit the CSS style sheets used by your WordPress theme.

See Styling Contact Form for a general explanation of styling CF7 forms using CSS. If you are not familiar with CSS, this page also includes some links to where you can learn CSS.